fix(inquirerer): apply inactivity timeout to all environments, not just non-TTY

[pyramation]

Summary

The PromptTimeoutError inactivity timeout (added in #90) was gated behind !(input as any).isTTY, so it only fired in non-TTY environments (CI, pipes). Running a CLI from a real terminal without required arguments would show an interactive prompt and hang forever instead of timing out with usage info.

- } else if (!noTty && !(input as any).isTTY) {
+ } else if (!noTty) {
    this.timeout = DEFAULT_NON_TTY_TIMEOUT;

The reset-on-keypress design (setupInputActivityListener / resetInactivityTimeout) already handles active interactive users — the timer resets on every keystroke, so it only fires after 15s of complete inactivity. This makes it safe to enable universally.

Also updated formatTimeoutError messaging to be environment-agnostic (no longer says "non-interactive environment").

Link to Devin session: https://app.devin.ai/sessions/0742309126f34ef584e8dd827828d723
Requested by: @pyramation

[devin-ai-integration]

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